| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.chemistry.opencmis.commons.impl; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * <p> |
| * Encodes and decodes to and from Base64 notation. |
| * </p> |
| * <p> |
| * Homepage: <a href="http://iharder.net/base64">http://iharder.net/base64</a>. |
| * </p> |
| * |
| * @author Robert Harder |
| * @author rob@iharder.net |
| * @version 2.3.7 |
| */ |
| public final class Base64 { |
| |
| protected static final Logger LOG = LoggerFactory.getLogger(Base64.class); |
| |
| /* ******** P U B L I C F I E L D S ******** */ |
| |
| /** No options specified. Value is zero. */ |
| public static final int NO_OPTIONS = 0; |
| |
| /** Specify encoding in first bit. Value is one. */ |
| public static final int ENCODE = 1; |
| |
| /** Specify decoding in first bit. Value is zero. */ |
| public static final int DECODE = 0; |
| |
| /** Specify that data should be gzip-compressed in second bit. Value is two. */ |
| public static final int GZIP = 2; |
| |
| /** |
| * Specify that gzipped data should <em>not</em> be automatically gunzipped. |
| */ |
| public static final int DONT_GUNZIP = 4; |
| |
| /** Do break lines when encoding. Value is 8. */ |
| public static final int DO_BREAK_LINES = 8; |
| |
| /** |
| * Encode using Base64-like encoding that is URL- and Filename-safe as |
| * described in Section 4 of RFC3548: <a |
| * href="http://www.faqs.org/rfcs/rfc3548.html" |
| * >http://www.faqs.org/rfcs/rfc3548.html</a>. It is important to note that |
| * data encoded this way is <em>not</em> officially valid Base64, or at the |
| * very least should not be called Base64 without also specifying that is |
| * was encoded using the URL- and Filename-safe dialect. |
| */ |
| public static final int URL_SAFE = 16; |
| |
| /** |
| * Encode using the special "ordered" dialect of Base64 described here: <a |
| * href="http://www.faqs.org/qa/rfcc-1940.html">http://www.faqs.org/qa/rfcc- |
| * 1940.html</a>. |
| */ |
| public static final int ORDERED = 32; |
| |
| /* ******** P R I V A T E F I E L D S ******** */ |
| |
| /** Maximum line length (76) of Base64 output. */ |
| private static final int MAX_LINE_LENGTH = 76; |
| |
| /** The equals sign (=) as a byte. */ |
| private static final byte EQUALS_SIGN = (byte) '='; |
| |
| /** The new line character (\n) as a byte. */ |
| private static final byte NEW_LINE = (byte) '\n'; |
| |
| /** Preferred encoding. */ |
| private static final String PREFERRED_ENCODING = "US-ASCII"; |
| |
| private static final byte WHITE_SPACE_ENC = -5; // Indicates white space in |
| // encoding |
| private static final byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in |
| // encoding |
| |
| /* ******** S T A N D A R D B A S E 6 4 A L P H A B E T ******** */ |
| |
| /** The 64 valid Base64 values. */ |
| /* |
| * Host platform me be something funny like EBCDIC, so we hardcode these |
| * values. |
| */ |
| private static final byte[] _STANDARD_ALPHABET = { (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', |
| (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', |
| (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', |
| (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', |
| (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', |
| (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', |
| (byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', |
| (byte) '7', (byte) '8', (byte) '9', (byte) '+', (byte) '/' }; |
| |
| /** |
| * Translates a Base64 value to either its 6-bit reconstruction value or a |
| * negative number indicating some other meaning. |
| **/ |
| private static final byte[] _STANDARD_DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal |
| // 0 |
| // - |
| // 8 |
| -5, -5, // Whitespace: Tab and Linefeed |
| -9, -9, // Decimal 11 - 12 |
| -5, // Whitespace: Carriage Return |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - |
| // 26 |
| -9, -9, -9, -9, -9, // Decimal 27 - 31 |
| -5, // Whitespace: Space |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42 |
| 62, // Plus sign at decimal 43 |
| -9, -9, -9, // Decimal 44 - 46 |
| 63, // Slash at decimal 47 |
| 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine |
| -9, -9, -9, // Decimal 58 - 60 |
| -1, // Equals sign at decimal 61 |
| -9, -9, -9, // Decimal 62 - 64 |
| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through |
| // 'N' |
| 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' |
| // through 'Z' |
| -9, -9, -9, -9, -9, -9, // Decimal 91 - 96 |
| 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' |
| // through 'm' |
| 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' |
| // through 'z' |
| -9, -9, -9, -9, -9 // Decimal 123 - 127 |
| , -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 128 - |
| // 139 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 140 - |
| // 152 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 153 - |
| // 165 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 166 - |
| // 178 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 179 - |
| // 191 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 192 - |
| // 204 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 205 - |
| // 217 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 218 - |
| // 230 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 231 - |
| // 243 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9 // Decimal 244 - 255 |
| }; |
| |
| /* ******** U R L S A F E B A S E 6 4 A L P H A B E T ******** */ |
| |
| /** |
| * Used in the URL- and Filename-safe dialect described in Section 4 of |
| * RFC3548: <a |
| * href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org |
| * /rfcs/rfc3548.html</a>. Notice that the last two bytes become "hyphen" |
| * and "underscore" instead of "plus" and "slash." |
| */ |
| private static final byte[] _URL_SAFE_ALPHABET = { (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', |
| (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', |
| (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', |
| (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', |
| (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', |
| (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', |
| (byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', |
| (byte) '7', (byte) '8', (byte) '9', (byte) '-', (byte) '_' }; |
| |
| /** |
| * Used in decoding URL- and Filename-safe dialects of Base64. |
| */ |
| private static final byte[] _URL_SAFE_DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal |
| // 0 |
| // - |
| // 8 |
| -5, -5, // Whitespace: Tab and Linefeed |
| -9, -9, // Decimal 11 - 12 |
| -5, // Whitespace: Carriage Return |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - |
| // 26 |
| -9, -9, -9, -9, -9, // Decimal 27 - 31 |
| -5, // Whitespace: Space |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42 |
| -9, // Plus sign at decimal 43 |
| -9, // Decimal 44 |
| 62, // Minus sign at decimal 45 |
| -9, // Decimal 46 |
| -9, // Slash at decimal 47 |
| 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine |
| -9, -9, -9, // Decimal 58 - 60 |
| -1, // Equals sign at decimal 61 |
| -9, -9, -9, // Decimal 62 - 64 |
| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through |
| // 'N' |
| 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' |
| // through 'Z' |
| -9, -9, -9, -9, // Decimal 91 - 94 |
| 63, // Underscore at decimal 95 |
| -9, // Decimal 96 |
| 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' |
| // through 'm' |
| 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' |
| // through 'z' |
| -9, -9, -9, -9, -9 // Decimal 123 - 127 |
| , -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 128 - |
| // 139 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 140 - |
| // 152 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 153 - |
| // 165 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 166 - |
| // 178 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 179 - |
| // 191 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 192 - |
| // 204 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 205 - |
| // 217 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 218 - |
| // 230 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 231 - |
| // 243 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9 // Decimal 244 - 255 |
| }; |
| |
| /* ******** O R D E R E D B A S E 6 4 A L P H A B E T ******** */ |
| |
| /** |
| * I don't get the point of this technique, but someone requested it, and it |
| * is described here: <a |
| * href="http://www.faqs.org/qa/rfcc-1940.html">http:// |
| * www.faqs.org/qa/rfcc-1940.html</a>. |
| */ |
| private static final byte[] _ORDERED_ALPHABET = { (byte) '-', (byte) '0', (byte) '1', (byte) '2', (byte) '3', |
| (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) 'A', (byte) 'B', (byte) 'C', |
| (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', |
| (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', |
| (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) '_', (byte) 'a', (byte) 'b', (byte) 'c', |
| (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', |
| (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', |
| (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z' }; |
| |
| /** |
| * Used in decoding the "ordered" dialect of Base64. |
| */ |
| private static final byte[] _ORDERED_DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal |
| // 0 |
| // - |
| // 8 |
| -5, -5, // Whitespace: Tab and Linefeed |
| -9, -9, // Decimal 11 - 12 |
| -5, // Whitespace: Carriage Return |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - |
| // 26 |
| -9, -9, -9, -9, -9, // Decimal 27 - 31 |
| -5, // Whitespace: Space |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42 |
| -9, // Plus sign at decimal 43 |
| -9, // Decimal 44 |
| 0, // Minus sign at decimal 45 |
| -9, // Decimal 46 |
| -9, // Slash at decimal 47 |
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, // Numbers zero through nine |
| -9, -9, -9, // Decimal 58 - 60 |
| -1, // Equals sign at decimal 61 |
| -9, -9, -9, // Decimal 62 - 64 |
| 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, // Letters 'A' |
| // through 'M' |
| 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, // Letters 'N' |
| // through 'Z' |
| -9, -9, -9, -9, // Decimal 91 - 94 |
| 37, // Underscore at decimal 95 |
| -9, // Decimal 96 |
| 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, // Letters 'a' |
| // through 'm' |
| 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, // Letters 'n' |
| // through 'z' |
| -9, -9, -9, -9, -9 // Decimal 123 - 127 |
| , -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 128 |
| // - 139 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 140 - |
| // 152 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 153 - |
| // 165 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 166 - |
| // 178 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 179 - |
| // 191 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 192 - |
| // 204 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 205 - |
| // 217 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 218 - |
| // 230 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 231 - |
| // 243 |
| -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9 // Decimal 244 - 255 |
| }; |
| |
| /* ******** D E T E R M I N E W H I C H A L H A B E T ******** */ |
| |
| /** |
| * Returns one of the _SOMETHING_ALPHABET byte arrays depending on the |
| * options specified. It's possible, though silly, to specify ORDERED |
| * <b>and</b> URLSAFE in which case one of them will be picked, though there |
| * is no guarantee as to which one will be picked. |
| */ |
| private static byte[] getAlphabet(int options) { |
| if ((options & URL_SAFE) == URL_SAFE) { |
| return _URL_SAFE_ALPHABET; |
| } else if ((options & ORDERED) == ORDERED) { |
| return _ORDERED_ALPHABET; |
| } else { |
| return _STANDARD_ALPHABET; |
| } |
| } // end getAlphabet |
| |
| /** |
| * Returns one of the _SOMETHING_DECODABET byte arrays depending on the |
| * options specified. It's possible, though silly, to specify ORDERED and |
| * URL_SAFE in which case one of them will be picked, though there is no |
| * guarantee as to which one will be picked. |
| */ |
| private static byte[] getDecodabet(int options) { |
| if ((options & URL_SAFE) == URL_SAFE) { |
| return _URL_SAFE_DECODABET; |
| } else if ((options & ORDERED) == ORDERED) { |
| return _ORDERED_DECODABET; |
| } else { |
| return _STANDARD_DECODABET; |
| } |
| } // end getAlphabet |
| |
| /** Defeats instantiation. */ |
| private Base64() { |
| } |
| |
| /* ******** E N C O D I N G M E T H O D S ******** */ |
| |
| /** |
| * Encodes up to the first three bytes of array <var>threeBytes</var> and |
| * returns a four-byte array in Base64 notation. The actual number of |
| * significant bytes in your array is given by <var>numSigBytes</var>. The |
| * array <var>threeBytes</var> needs only be as big as |
| * <var>numSigBytes</var>. Code can reuse a byte array by passing a |
| * four-byte array as <var>b4</var>. |
| * |
| * @param b4 |
| * A reusable byte array to reduce array instantiation |
| * @param threeBytes |
| * the array to convert |
| * @param numSigBytes |
| * the number of significant bytes in your array |
| * @return four byte array in Base64 notation. |
| * @since 1.5.1 |
| */ |
| private static byte[] encode3to4(byte[] b4, byte[] threeBytes, int numSigBytes, int options) { |
| encode3to4(threeBytes, 0, numSigBytes, b4, 0, options); |
| return b4; |
| } // end encode3to4 |
| |
| /** |
| * <p> |
| * Encodes up to three bytes of the array <var>source</var> and writes the |
| * resulting four Base64 bytes to <var>destination</var>. The source and |
| * destination arrays can be manipulated anywhere along their length by |
| * specifying <var>srcOffset</var> and <var>destOffset</var>. This method |
| * does not check to make sure your arrays are large enough to accomodate |
| * <var>srcOffset</var> + 3 for the <var>source</var> array or |
| * <var>destOffset</var> + 4 for the <var>destination</var> array. The |
| * actual number of significant bytes in your array is given by |
| * <var>numSigBytes</var>. |
| * </p> |
| * <p> |
| * This is the lowest level of the encoding methods with all possible |
| * parameters. |
| * </p> |
| * |
| * @param source |
| * the array to convert |
| * @param srcOffset |
| * the index where conversion begins |
| * @param numSigBytes |
| * the number of significant bytes in your array |
| * @param destination |
| * the array to hold the conversion |
| * @param destOffset |
| * the index where output will be put |
| * @return the <var>destination</var> array |
| * @since 1.3 |
| */ |
| private static byte[] encode3to4(byte[] source, int srcOffset, int numSigBytes, byte[] destination, int destOffset, |
| int options) { |
| |
| byte[] ALPHABET = getAlphabet(options); |
| |
| // 1 2 3 |
| // 01234567890123456789012345678901 Bit position |
| // --------000000001111111122222222 Array position from threeBytes |
| // --------| || || || | Six bit groups to index ALPHABET |
| // >>18 >>12 >> 6 >> 0 Right shift necessary |
| // 0x3f 0x3f 0x3f Additional AND |
| |
| // Create buffer with zero-padding if there are only one or two |
| // significant bytes passed in the array. |
| // We have to shift left 24 in order to flush out the 1's that appear |
| // when Java treats a value as negative that is cast from a byte to an |
| // int. |
| int inBuff = (numSigBytes > 0 ? ((source[srcOffset] << 24) >>> 8) : 0) |
| | (numSigBytes > 1 ? ((source[srcOffset + 1] << 24) >>> 16) : 0) |
| | (numSigBytes > 2 ? ((source[srcOffset + 2] << 24) >>> 24) : 0); |
| |
| switch (numSigBytes) { |
| case 3: |
| destination[destOffset] = ALPHABET[(inBuff >>> 18)]; |
| destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f]; |
| destination[destOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3f]; |
| destination[destOffset + 3] = ALPHABET[(inBuff) & 0x3f]; |
| return destination; |
| |
| case 2: |
| destination[destOffset] = ALPHABET[(inBuff >>> 18)]; |
| destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f]; |
| destination[destOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3f]; |
| destination[destOffset + 3] = EQUALS_SIGN; |
| return destination; |
| |
| case 1: |
| destination[destOffset] = ALPHABET[(inBuff >>> 18)]; |
| destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f]; |
| destination[destOffset + 2] = EQUALS_SIGN; |
| destination[destOffset + 3] = EQUALS_SIGN; |
| return destination; |
| |
| default: |
| return destination; |
| } // end switch |
| } // end encode3to4 |
| |
| /** |
| * Performs Base64 encoding on the <code>raw</code> ByteBuffer, writing it |
| * to the <code>encoded</code> ByteBuffer. This is an experimental feature. |
| * Currently it does not pass along any options (such as |
| * {@link #DO_BREAK_LINES} or {@link #GZIP}. |
| * |
| * @param raw |
| * input buffer |
| * @param encoded |
| * output buffer |
| * @since 2.3 |
| */ |
| public static void encode(java.nio.ByteBuffer raw, java.nio.ByteBuffer encoded) { |
| byte[] raw3 = new byte[3]; |
| byte[] enc4 = new byte[4]; |
| |
| while (raw.hasRemaining()) { |
| int rem = Math.min(3, raw.remaining()); |
| raw.get(raw3, 0, rem); |
| Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS); |
| encoded.put(enc4); |
| } // end input remaining |
| } |
| |
| /** |
| * Performs Base64 encoding on the <code>raw</code> ByteBuffer, writing it |
| * to the <code>encoded</code> CharBuffer. This is an experimental feature. |
| * Currently it does not pass along any options (such as |
| * {@link #DO_BREAK_LINES} or {@link #GZIP}. |
| * |
| * @param raw |
| * input buffer |
| * @param encoded |
| * output buffer |
| * @since 2.3 |
| */ |
| public static void encode(java.nio.ByteBuffer raw, java.nio.CharBuffer encoded) { |
| byte[] raw3 = new byte[3]; |
| byte[] enc4 = new byte[4]; |
| |
| while (raw.hasRemaining()) { |
| int rem = Math.min(3, raw.remaining()); |
| raw.get(raw3, 0, rem); |
| Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS); |
| for (int i = 0; i < 4; i++) { |
| encoded.put((char) (enc4[i] & 0xFF)); |
| } |
| } // end input remaining |
| } |
| |
| /** |
| * Serializes an object and returns the Base64-encoded version of that |
| * serialized object. |
| * |
| * <p> |
| * As of v 2.3, if the object cannot be serialized or there is another |
| * error, the method will throw an java.io.IOException. <b>This is new to |
| * v2.3!</b> In earlier versions, it just returned a null value, but in |
| * retrospect that's a pretty poor way to handle it. |
| * </p> |
| * |
| * The object is not GZip-compressed before being encoded. |
| * |
| * @param serializableObject |
| * The object to encode |
| * @return The Base64-encoded object |
| * @throws java.io.IOException |
| * if there is an error |
| * @throws NullPointerException |
| * if serializedObject is null |
| * @since 1.4 |
| */ |
| public static String encodeObject(java.io.Serializable serializableObject) throws java.io.IOException { |
| return encodeObject(serializableObject, NO_OPTIONS); |
| } // end encodeObject |
| |
| /** |
| * Serializes an object and returns the Base64-encoded version of that |
| * serialized object. |
| * |
| * <p> |
| * As of v 2.3, if the object cannot be serialized or there is another |
| * error, the method will throw an java.io.IOException. <b>This is new to |
| * v2.3!</b> In earlier versions, it just returned a null value, but in |
| * retrospect that's a pretty poor way to handle it. |
| * </p> |
| * |
| * The object is not GZip-compressed before being encoded. |
| * <p> |
| * Example options: |
| * |
| * <pre> |
| * GZIP: gzip-compresses object before encoding it. |
| * DO_BREAK_LINES: break lines at 76 characters |
| * </pre> |
| * <p> |
| * Example: <code>encodeObject( myObj, Base64.GZIP )</code> or |
| * <p> |
| * Example: |
| * <code>encodeObject( myObj, Base64.GZIP | Base64.DO_BREAK_LINES )</code> |
| * |
| * @param serializableObject |
| * The object to encode |
| * @param options |
| * Specified options |
| * @return The Base64-encoded object |
| * @see Base64#GZIP |
| * @see Base64#DO_BREAK_LINES |
| * @throws java.io.IOException |
| * if there is an error |
| * @since 2.0 |
| */ |
| public static String encodeObject(java.io.Serializable serializableObject, int options) throws java.io.IOException { |
| |
| if (serializableObject == null) { |
| throw new NullPointerException("Cannot serialize a null object."); |
| } // end if: null |
| |
| // Streams |
| java.io.ByteArrayOutputStream baos = null; |
| java.io.OutputStream b64os = null; |
| java.util.zip.GZIPOutputStream gzos = null; |
| java.io.ObjectOutputStream oos = null; |
| |
| try { |
| // ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream |
| baos = new java.io.ByteArrayOutputStream(); |
| b64os = new Base64.OutputStream(baos, ENCODE | options); |
| if ((options & GZIP) != 0) { |
| // Gzip |
| gzos = new java.util.zip.GZIPOutputStream(b64os); |
| oos = new java.io.ObjectOutputStream(gzos); |
| } else { |
| // Not gzipped |
| oos = new java.io.ObjectOutputStream(b64os); |
| } |
| oos.writeObject(serializableObject); |
| } // end try |
| catch (java.io.IOException e) { |
| // Catch it and then throw it immediately so that |
| // the finally{} block is called for cleanup. |
| throw e; |
| } // end catch |
| finally { |
| IOUtils.closeQuietly(oos); |
| IOUtils.closeQuietly(gzos); |
| IOUtils.closeQuietly(b64os); |
| IOUtils.closeQuietly(baos); |
| } // end finally |
| |
| // Return value according to relevant encoding. |
| try { |
| return new String(baos.toByteArray(), PREFERRED_ENCODING); |
| } // end try |
| catch (java.io.UnsupportedEncodingException uue) { |
| // Fall back to UTF-8 |
| return IOUtils.toUTF8String(baos.toByteArray()); |
| } // end catch |
| |
| } // end encode |
| |
| /** |
| * Encodes a byte array into Base64 notation. Does not GZip-compress data. |
| * |
| * @param source |
| * The data to convert |
| * @return The data in Base64-encoded form |
| * @throws NullPointerException |
| * if source array is null |
| * @since 1.4 |
| */ |
| public static String encodeBytes(byte[] source) { |
| // Since we're not going to have the GZIP encoding turned on, |
| // we're not going to have an java.io.IOException thrown, so |
| // we should not force the user to have to catch it. |
| String encoded = null; |
| try { |
| encoded = encodeBytes(source, 0, source.length, NO_OPTIONS); |
| } catch (java.io.IOException ex) { |
| assert false : ex.getMessage(); |
| } // end catch |
| assert encoded != null; |
| return encoded; |
| } // end encodeBytes |
| |
| /** |
| * Encodes a byte array into Base64 notation. |
| * <p> |
| * Example options: |
| * |
| * <pre> |
| * GZIP: gzip-compresses object before encoding it. |
| * DO_BREAK_LINES: break lines at 76 characters |
| * <i>Note: Technically, this makes your encoding non-compliant.</i> |
| * </pre> |
| * <p> |
| * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or |
| * <p> |
| * Example: |
| * <code>encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )</code> |
| * |
| * |
| * <p> |
| * As of v 2.3, if there is an error with the GZIP stream, the method will |
| * throw an java.io.IOException. <b>This is new to v2.3!</b> In earlier |
| * versions, it just returned a null value, but in retrospect that's a |
| * pretty poor way to handle it. |
| * </p> |
| * |
| * |
| * @param source |
| * The data to convert |
| * @param options |
| * Specified options |
| * @return The Base64-encoded data as a String |
| * @see Base64#GZIP |
| * @see Base64#DO_BREAK_LINES |
| * @throws java.io.IOException |
| * if there is an error |
| * @throws NullPointerException |
| * if source array is null |
| * @since 2.0 |
| */ |
| public static String encodeBytes(byte[] source, int options) throws java.io.IOException { |
| return encodeBytes(source, 0, source.length, options); |
| } // end encodeBytes |
| |
| /** |
| * Encodes a byte array into Base64 notation. Does not GZip-compress data. |
| * |
| * <p> |
| * As of v 2.3, if there is an error, the method will throw an |
| * java.io.IOException. <b>This is new to v2.3!</b> In earlier versions, it |
| * just returned a null value, but in retrospect that's a pretty poor way to |
| * handle it. |
| * </p> |
| * |
| * |
| * @param source |
| * The data to convert |
| * @param off |
| * Offset in array where conversion should begin |
| * @param len |
| * Length of data to convert |
| * @return The Base64-encoded data as a String |
| * @throws NullPointerException |
| * if source array is null |
| * @throws IllegalArgumentException |
| * if source array, offset, or length are invalid |
| * @since 1.4 |
| */ |
| public static String encodeBytes(byte[] source, int off, int len) { |
| // Since we're not going to have the GZIP encoding turned on, |
| // we're not going to have an java.io.IOException thrown, so |
| // we should not force the user to have to catch it. |
| String encoded = null; |
| try { |
| encoded = encodeBytes(source, off, len, NO_OPTIONS); |
| } catch (java.io.IOException ex) { |
| assert false : ex.getMessage(); |
| } // end catch |
| assert encoded != null; |
| return encoded; |
| } // end encodeBytes |
| |
| /** |
| * Encodes a byte array into Base64 notation. |
| * <p> |
| * Example options: |
| * |
| * <pre> |
| * GZIP: gzip-compresses object before encoding it. |
| * DO_BREAK_LINES: break lines at 76 characters |
| * <i>Note: Technically, this makes your encoding non-compliant.</i> |
| * </pre> |
| * <p> |
| * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or |
| * <p> |
| * Example: |
| * <code>encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )</code> |
| * |
| * |
| * <p> |
| * As of v 2.3, if there is an error with the GZIP stream, the method will |
| * throw an java.io.IOException. <b>This is new to v2.3!</b> In earlier |
| * versions, it just returned a null value, but in retrospect that's a |
| * pretty poor way to handle it. |
| * </p> |
| * |
| * |
| * @param source |
| * The data to convert |
| * @param off |
| * Offset in array where conversion should begin |
| * @param len |
| * Length of data to convert |
| * @param options |
| * Specified options |
| * @return The Base64-encoded data as a String |
| * @see Base64#GZIP |
| * @see Base64#DO_BREAK_LINES |
| * @throws java.io.IOException |
| * if there is an error |
| * @throws NullPointerException |
| * if source array is null |
| * @throws IllegalArgumentException |
| * if source array, offset, or length are invalid |
| * @since 2.0 |
| */ |
| public static String encodeBytes(byte[] source, int off, int len, int options) throws java.io.IOException { |
| byte[] encoded = encodeBytesToBytes(source, off, len, options); |
| |
| // Return value according to relevant encoding. |
| try { |
| return new String(encoded, PREFERRED_ENCODING); |
| } // end try |
| catch (java.io.UnsupportedEncodingException uue) { |
| return IOUtils.toUTF8String(encoded); |
| } // end catch |
| |
| } // end encodeBytes |
| |
| /** |
| * Similar to {@link #encodeBytes(byte[])} but returns a byte array instead |
| * of instantiating a String. This is more efficient if you're working with |
| * I/O streams and have large data sets to encode. |
| * |
| * |
| * @param source |
| * The data to convert |
| * @return The Base64-encoded data as a byte[] (of ASCII characters) |
| * @throws NullPointerException |
| * if source array is null |
| * @since 2.3.1 |
| */ |
| public static byte[] encodeBytesToBytes(byte[] source) { |
| byte[] encoded = null; |
| try { |
| encoded = encodeBytesToBytes(source, 0, source.length, Base64.NO_OPTIONS); |
| } catch (java.io.IOException ex) { |
| assert false : "IOExceptions only come from GZipping, which is turned off: " + ex.getMessage(); |
| } |
| return encoded; |
| } |
| |
| /** |
| * Similar to {@link #encodeBytes(byte[], int, int, int)} but returns a byte |
| * array instead of instantiating a String. This is more efficient if you're |
| * working with I/O streams and have large data sets to encode. |
| * |
| * |
| * @param source |
| * The data to convert |
| * @param off |
| * Offset in array where conversion should begin |
| * @param len |
| * Length of data to convert |
| * @param options |
| * Specified options |
| * @return The Base64-encoded data as a String |
| * @see Base64#GZIP |
| * @see Base64#DO_BREAK_LINES |
| * @throws java.io.IOException |
| * if there is an error |
| * @throws NullPointerException |
| * if source array is null |
| * @throws IllegalArgumentException |
| * if source array, offset, or length are invalid |
| * @since 2.3.1 |
| */ |
| public static byte[] encodeBytesToBytes(byte[] source, int off, int len, int options) throws java.io.IOException { |
| |
| if (source == null) { |
| throw new NullPointerException("Cannot serialize a null array."); |
| } // end if: null |
| |
| if (off < 0) { |
| throw new IllegalArgumentException("Cannot have negative offset: " + off); |
| } // end if: off < 0 |
| |
| if (len < 0) { |
| throw new IllegalArgumentException("Cannot have length offset: " + len); |
| } // end if: len < 0 |
| |
| if (off + len > source.length) { |
| throw new IllegalArgumentException(String.format( |
| "Cannot have offset of %d and length of %d with array of length %d", off, len, source.length)); |
| } // end if: off < 0 |
| |
| // Compress? |
| if ((options & GZIP) != 0) { |
| java.io.ByteArrayOutputStream baos = null; |
| java.util.zip.GZIPOutputStream gzos = null; |
| Base64.OutputStream b64os = null; |
| |
| try { |
| // GZip -> Base64 -> ByteArray |
| baos = new java.io.ByteArrayOutputStream(); |
| b64os = new Base64.OutputStream(baos, ENCODE | options); |
| gzos = new java.util.zip.GZIPOutputStream(b64os); |
| |
| gzos.write(source, off, len); |
| gzos.close(); |
| } // end try |
| catch (java.io.IOException e) { |
| // Catch it and then throw it immediately so that |
| // the finally{} block is called for cleanup. |
| throw e; |
| } // end catch |
| finally { |
| IOUtils.closeQuietly(gzos); |
| IOUtils.closeQuietly(b64os); |
| IOUtils.closeQuietly(baos); |
| } // end finally |
| |
| return baos.toByteArray(); |
| } // end if: compress |
| |
| // Else, don't compress. Better not to use streams at all then. |
| else { |
| boolean breakLines = (options & DO_BREAK_LINES) != 0; |
| |
| // int len43 = len * 4 / 3; |
| // byte[] outBuff = new byte[ ( len43 ) // Main 4:3 |
| // + ( (len % 3) > 0 ? 4 : 0 ) // Account for padding |
| // + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines |
| // Try to determine more precisely how big the array needs to be. |
| // If we get it right, we don't have to do an array copy, and |
| // we save a bunch of memory. |
| int encLen = (len / 3) * 4 + (len % 3 > 0 ? 4 : 0); // Bytes needed |
| // for actual |
| // encoding |
| if (breakLines) { |
| encLen += encLen / MAX_LINE_LENGTH; // Plus extra newline |
| // characters |
| } |
| byte[] outBuff = new byte[encLen]; |
| |
| int d = 0; |
| int e = 0; |
| int len2 = len - 2; |
| int lineLength = 0; |
| for (; d < len2; d += 3, e += 4) { |
| encode3to4(source, d + off, 3, outBuff, e, options); |
| |
| lineLength += 4; |
| if (breakLines && lineLength >= MAX_LINE_LENGTH) { |
| outBuff[e + 4] = NEW_LINE; |
| e++; |
| lineLength = 0; |
| } // end if: end of line |
| } // en dfor: each piece of array |
| |
| if (d < len) { |
| encode3to4(source, d + off, len - d, outBuff, e, options); |
| e += 4; |
| } // end if: some padding needed |
| |
| // Only resize array if we didn't guess it right. |
| if (e <= outBuff.length - 1) { |
| // If breaking lines and the last byte falls right at |
| // the line length (76 bytes per line), there will be |
| // one extra byte, and the array will need to be resized. |
| // Not too bad of an estimate on array size, I'd say. |
| byte[] finalOut = new byte[e]; |
| System.arraycopy(outBuff, 0, finalOut, 0, e); |
| // System.err.println("Having to resize array from " + |
| // outBuff.length + " to " + e ); |
| return finalOut; |
| } else { |
| // System.err.println("No need to resize array."); |
| return outBuff; |
| } |
| |
| } // end else: don't compress |
| |
| } // end encodeBytesToBytes |
| |
| /* ******** D E C O D I N G M E T H O D S ******** */ |
| |
| /** |
| * Decodes four bytes from array <var>source</var> and writes the resulting |
| * bytes (up to three of them) to <var>destination</var>. The source and |
| * destination arrays can be manipulated anywhere along their length by |
| * specifying <var>srcOffset</var> and <var>destOffset</var>. This method |
| * does not check to make sure your arrays are large enough to accomodate |
| * <var>srcOffset</var> + 4 for the <var>source</var> array or |
| * <var>destOffset</var> + 3 for the <var>destination</var> array. This |
| * method returns the actual number of bytes that were converted from the |
| * Base64 encoding. |
| * <p> |
| * This is the lowest level of the decoding methods with all possible |
| * parameters. |
| * </p> |
| * |
| * |
| * @param source |
| * the array to convert |
| * @param srcOffset |
| * the index where conversion begins |
| * @param destination |
| * the array to hold the conversion |
| * @param destOffset |
| * the index where output will be put |
| * @param options |
| * alphabet type is pulled from this (standard, url-safe, |
| * ordered) |
| * @return the number of decoded bytes converted |
| * @throws NullPointerException |
| * if source or destination arrays are null |
| * @throws IllegalArgumentException |
| * if srcOffset or destOffset are invalid or there is not enough |
| * room in the array. |
| * @since 1.3 |
| */ |
| private static int decode4to3(byte[] source, int srcOffset, byte[] destination, int destOffset, int options) { |
| |
| // Lots of error checking and exception throwing |
| if (source == null) { |
| throw new NullPointerException("Source array was null."); |
| } // end if |
| if (destination == null) { |
| throw new NullPointerException("Destination array was null."); |
| } // end if |
| if (srcOffset < 0 || srcOffset + 3 >= source.length) { |
| throw new IllegalArgumentException(String.format( |
| "Source array with length %d cannot have offset of %d and still process four bytes.", |
| source.length, srcOffset)); |
| } // end if |
| if (destOffset < 0 || destOffset + 2 >= destination.length) { |
| throw new IllegalArgumentException(String.format( |
| "Destination array with length %d cannot have offset of %d and still store three bytes.", |
| destination.length, destOffset)); |
| } // end if |
| |
| byte[] DECODABET = getDecodabet(options); |
| |
| // Example: Dk== |
| if (source[srcOffset + 2] == EQUALS_SIGN) { |
| // Two ways to do the same thing. Don't know which way I like best. |
| // int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 |
| // ) |
| // | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 ); |
| int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18) |
| | ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12); |
| |
| destination[destOffset] = (byte) (outBuff >>> 16); |
| return 1; |
| } |
| |
| // Example: DkL= |
| else if (source[srcOffset + 3] == EQUALS_SIGN) { |
| // Two ways to do the same thing. Don't know which way I like best. |
| // int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 |
| // ) |
| // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 ) |
| // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 ); |
| int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18) |
| | ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12) |
| | ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6); |
| |
| destination[destOffset] = (byte) (outBuff >>> 16); |
| destination[destOffset + 1] = (byte) (outBuff >>> 8); |
| return 2; |
| } |
| |
| // Example: DkLE |
| else { |
| // Two ways to do the same thing. Don't know which way I like best. |
| // int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 |
| // ) |
| // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 ) |
| // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 ) |
| // | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 ); |
| int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18) |
| | ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12) |
| | ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6) | ((DECODABET[source[srcOffset + 3]] & 0xFF)); |
| |
| destination[destOffset] = (byte) (outBuff >> 16); |
| destination[destOffset + 1] = (byte) (outBuff >> 8); |
| destination[destOffset + 2] = (byte) (outBuff); |
| |
| return 3; |
| } |
| } // end decodeToBytes |
| |
| /** |
| * Low-level access to decoding ASCII characters in the form of a byte |
| * array. <strong>Ignores GUNZIP option, if it's set.</strong> This is not |
| * generally a recommended method, although it is used internally as part of |
| * the decoding process. Special case: if len = 0, an empty array is |
| * returned. Still, if you need more speed and reduced memory footprint (and |
| * aren't gzipping), consider this method. |
| * |
| * @param source |
| * The Base64 encoded data |
| * @return decoded data |
| * @since 2.3.1 |
| */ |
| public static byte[] decode(byte[] source) throws java.io.IOException { |
| byte[] decoded = null; |
| // try { |
| decoded = decode(source, 0, source.length, Base64.NO_OPTIONS); |
| // } catch( java.io.IOException ex ) { |
| // assert false : |
| // "IOExceptions only come from GZipping, which is turned off: " + |
| // ex.getMessage(); |
| // } |
| return decoded; |
| } |
| |
| /** |
| * Low-level access to decoding ASCII characters in the form of a byte |
| * array. <strong>Ignores GUNZIP option, if it's set.</strong> This is not |
| * generally a recommended method, although it is used internally as part of |
| * the decoding process. Special case: if len = 0, an empty array is |
| * returned. Still, if you need more speed and reduced memory footprint (and |
| * aren't gzipping), consider this method. |
| * |
| * @param source |
| * The Base64 encoded data |
| * @param off |
| * The offset of where to begin decoding |
| * @param len |
| * The length of characters to decode |
| * @param options |
| * Can specify options such as alphabet type to use |
| * @return decoded data |
| * @throws java.io.IOException |
| * If bogus characters exist in source data |
| * @since 1.3 |
| */ |
| public static byte[] decode(byte[] source, int off, int len, int options) throws java.io.IOException { |
| |
| // Lots of error checking and exception throwing |
| if (source == null) { |
| throw new NullPointerException("Cannot decode null source array."); |
| } // end if |
| if (off < 0 || off + len > source.length) { |
| throw new IllegalArgumentException(String.format( |
| "Source array with length %d cannot have offset of %d and process %d bytes.", source.length, off, |
| len)); |
| } // end if |
| |
| if (len == 0) { |
| return new byte[0]; |
| } else if (len < 4) { |
| throw new IllegalArgumentException( |
| "Base64-encoded string must have at least four characters, but length specified was " + len); |
| } // end if |
| |
| byte[] DECODABET = getDecodabet(options); |
| |
| int len34 = len * 3 / 4; // Estimate on array size |
| byte[] outBuff = new byte[len34]; // Upper limit on size of output |
| int outBuffPosn = 0; // Keep track of where we're writing |
| |
| byte[] b4 = new byte[4]; // Four byte buffer from source, eliminating |
| // white space |
| int b4Posn = 0; // Keep track of four byte input buffer |
| int i = 0; // Source array counter |
| byte sbiDecode = 0; // Special value from DECODABET |
| |
| for (i = off; i < off + len; i++) { // Loop through source |
| |
| sbiDecode = DECODABET[source[i] & 0xFF]; |
| |
| // White space, Equals sign, or legit Base64 character |
| // Note the values such as -5 and -9 in the |
| // DECODABETs at the top of the file. |
| if (sbiDecode >= WHITE_SPACE_ENC) { |
| if (sbiDecode >= EQUALS_SIGN_ENC) { |
| b4[b4Posn++] = source[i]; // Save non-whitespace |
| if (b4Posn > 3) { // Time to decode? |
| outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn, options); |
| b4Posn = 0; |
| |
| // If that was the equals sign, break out of 'for' loop |
| if (source[i] == EQUALS_SIGN) { |
| break; |
| } // end if: equals sign |
| } // end if: quartet built |
| } // end if: equals sign or better |
| } // end if: white space, equals sign or better |
| else { |
| // There's a bad input character in the Base64 stream. |
| throw new java.io.IOException(String.format( |
| "Bad Base64 input character decimal %d in array position %d", ((int) source[i]) & 0xFF, i)); |
| } // end else: |
| } // each input character |
| |
| byte[] out = new byte[outBuffPosn]; |
| System.arraycopy(outBuff, 0, out, 0, outBuffPosn); |
| return out; |
| } // end decode |
| |
| /** |
| * Decodes data from Base64 notation, automatically detecting |
| * gzip-compressed data and decompressing it. |
| * |
| * @param s |
| * the string to decode |
| * @return the decoded data |
| * @throws java.io.IOException |
| * If there is a problem |
| * @since 1.4 |
| */ |
| public static byte[] decode(String s) throws java.io.IOException { |
| return decode(s, NO_OPTIONS); |
| } |
| |
| /** |
| * Decodes data from Base64 notation, automatically detecting |
| * gzip-compressed data and decompressing it. |
| * |
| * @param s |
| * the string to decode |
| * @param options |
| * encode options such as URL_SAFE |
| * @return the decoded data |
| * @throws java.io.IOException |
| * if there is an error |
| * @throws NullPointerException |
| * if <tt>s</tt> is null |
| * @since 1.4 |
| */ |
| public static byte[] decode(String s, int options) throws java.io.IOException { |
| |
| if (s == null) { |
| throw new NullPointerException("Input string was null."); |
| } // end if |
| |
| byte[] bytes; |
| try { |
| bytes = s.getBytes(PREFERRED_ENCODING); |
| } // end try |
| catch (java.io.UnsupportedEncodingException uee) { |
| bytes = IOUtils.toUTF8Bytes(s); |
| } // end catch |
| // </change> |
| |
| // Decode |
| bytes = decode(bytes, 0, bytes.length, options); |
| |
| // Check to see if it's gzip-compressed |
| // GZIP Magic Two-Byte Number: 0x8b1f (35615) |
| boolean dontGunzip = (options & DONT_GUNZIP) != 0; |
| if ((bytes != null) && (bytes.length >= 4) && (!dontGunzip)) { |
| |
| int head = ((int) bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00); |
| if (java.util.zip.GZIPInputStream.GZIP_MAGIC == head) { |
| java.io.ByteArrayInputStream bais = null; |
| java.util.zip.GZIPInputStream gzis = null; |
| java.io.ByteArrayOutputStream baos = null; |
| byte[] buffer = new byte[2048]; |
| int length = 0; |
| |
| try { |
| baos = new java.io.ByteArrayOutputStream(); |
| bais = new java.io.ByteArrayInputStream(bytes); |
| gzis = new java.util.zip.GZIPInputStream(bais, 64 * 1024); |
| |
| while ((length = gzis.read(buffer)) >= 0) { |
| baos.write(buffer, 0, length); |
| } // end while: reading input |
| |
| // No error? Get new bytes. |
| bytes = baos.toByteArray(); |
| |
| } // end try |
| catch (java.io.IOException e) { |
| LOG.error(e.getMessage(), e); |
| // Just return originally-decoded bytes |
| } // end catch |
| finally { |
| IOUtils.closeQuietly(baos); |
| IOUtils.closeQuietly(gzis); |
| IOUtils.closeQuietly(bais); |
| } // end finally |
| |
| } // end if: gzipped |
| } // end if: bytes.length >= 2 |
| |
| return bytes; |
| } // end decode |
| |
| /** |
| * Attempts to decode Base64 data and deserialize a Java Object within. |
| * Returns <tt>null</tt> if there was an error. |
| * |
| * @param encodedObject |
| * The Base64 data to decode |
| * @return The decoded and deserialized object |
| * @throws NullPointerException |
| * if encodedObject is null |
| * @throws java.io.IOException |
| * if there is a general error |
| * @throws ClassNotFoundException |
| * if the decoded object is of a class that cannot be found by |
| * the JVM |
| * @since 1.5 |
| */ |
| public static Object decodeToObject(String encodedObject) throws java.io.IOException, |
| java.lang.ClassNotFoundException { |
| return decodeToObject(encodedObject, NO_OPTIONS, null); |
| } |
| |
| /** |
| * Attempts to decode Base64 data and deserialize a Java Object within. |
| * Returns <tt>null</tt> if there was an error. If <tt>loader</tt> is not |
| * null, it will be the class loader used when deserializing. |
| * |
| * @param encodedObject |
| * The Base64 data to decode |
| * @param options |
| * Various parameters related to decoding |
| * @param loader |
| * Optional class loader to use in deserializing classes. |
| * @return The decoded and deserialized object |
| * @throws NullPointerException |
| * if encodedObject is null |
| * @throws java.io.IOException |
| * if there is a general error |
| * @throws ClassNotFoundException |
| * if the decoded object is of a class that cannot be found by |
| * the JVM |
| * @since 2.3.4 |
| */ |
| public static Object decodeToObject(String encodedObject, int options, final ClassLoader loader) |
| throws java.io.IOException, java.lang.ClassNotFoundException { |
| |
| // Decode and gunzip if necessary |
| byte[] objBytes = decode(encodedObject, options); |
| |
| java.io.ByteArrayInputStream bais = null; |
| java.io.ObjectInputStream ois = null; |
| Object obj = null; |
| |
| try { |
| bais = new java.io.ByteArrayInputStream(objBytes); |
| |
| // If no custom class loader is provided, use Java's builtin OIS. |
| if (loader == null) { |
| ois = new java.io.ObjectInputStream(bais); |
| } // end if: no loader provided |
| |
| // Else make a customized object input stream that uses |
| // the provided class loader. |
| else { |
| ois = new java.io.ObjectInputStream(bais) { |
| @Override |
| public Class<?> resolveClass(java.io.ObjectStreamClass streamClass) throws java.io.IOException, |
| ClassNotFoundException { |
| Class<?> c = Class.forName(streamClass.getName(), false, loader); |
| if (c == null) { |
| return super.resolveClass(streamClass); |
| } else { |
| return c; // Class loader knows of this class. |
| } // end else: not null |
| } // end resolveClass |
| }; // end ois |
| } // end else: no custom class loader |
| |
| obj = ois.readObject(); |
| } // end try |
| catch (java.io.IOException e) { |
| throw e; // Catch and throw in order to execute finally{} |
| } // end catch |
| catch (java.lang.ClassNotFoundException e) { |
| throw e; // Catch and throw in order to execute finally{} |
| } // end catch |
| finally { |
| IOUtils.closeQuietly(bais); |
| IOUtils.closeQuietly(ois); |
| } // end finally |
| |
| return obj; |
| } // end decodeObject |
| |
| /** |
| * Convenience method for encoding data to a file. |
| * |
| * <p> |
| * As of v 2.3, if there is a error, the method will throw an |
| * java.io.IOException. <b>This is new to v2.3!</b> In earlier versions, it |
| * just returned false, but in retrospect that's a pretty poor way to handle |
| * it. |
| * </p> |
| * |
| * @param dataToEncode |
| * byte array of data to encode in base64 form |
| * @param filename |
| * Filename for saving encoded data |
| * @throws java.io.IOException |
| * if there is an error |
| * @throws NullPointerException |
| * if dataToEncode is null |
| * @since 2.1 |
| */ |
| public static void encodeToFile(byte[] dataToEncode, String filename) throws java.io.IOException { |
| |
| if (dataToEncode == null) { |
| throw new NullPointerException("Data to encode was null."); |
| } // end iff |
| |
| Base64.OutputStream bos = null; |
| try { |
| bos = new Base64.OutputStream(new java.io.FileOutputStream(filename), Base64.ENCODE); |
| bos.write(dataToEncode); |
| } // end try |
| catch (java.io.IOException e) { |
| throw e; // Catch and throw to execute finally{} block |
| } // end catch: java.io.IOException |
| finally { |
| IOUtils.closeQuietly(bos); |
| } // end finally |
| |
| } // end encodeToFile |
| |
| /** |
| * Convenience method for decoding data to a file. |
| * |
| * <p> |
| * As of v 2.3, if there is a error, the method will throw an |
| * java.io.IOException. <b>This is new to v2.3!</b> In earlier versions, it |
| * just returned false, but in retrospect that's a pretty poor way to handle |
| * it. |
| * </p> |
| * |
| * @param dataToDecode |
| * Base64-encoded data as a string |
| * @param filename |
| * Filename for saving decoded data |
| * @throws java.io.IOException |
| * if there is an error |
| * @since 2.1 |
| */ |
| public static void decodeToFile(String dataToDecode, String filename) throws java.io.IOException { |
| |
| Base64.OutputStream bos = null; |
| try { |
| bos = new Base64.OutputStream(new java.io.FileOutputStream(filename), Base64.DECODE); |
| bos.write(dataToDecode.getBytes(PREFERRED_ENCODING)); |
| } // end try |
| catch (java.io.IOException e) { |
| throw e; // Catch and throw to execute finally{} block |
| } // end catch: java.io.IOException |
| finally { |
| IOUtils.closeQuietly(bos); |
| } // end finally |
| |
| } // end decodeToFile |
| |
| /** |
| * Convenience method for reading a base64-encoded file and decoding it. |
| * |
| * <p> |
| * As of v 2.3, if there is a error, the method will throw an |
| * java.io.IOException. <b>This is new to v2.3!</b> In earlier versions, it |
| * just returned false, but in retrospect that's a pretty poor way to handle |
| * it. |
| * </p> |
| * |
| * @param filename |
| * Filename for reading encoded data |
| * @return decoded byte array |
| * @throws java.io.IOException |
| * if there is an error |
| * @since 2.1 |
| */ |
| public static byte[] decodeFromFile(String filename) throws java.io.IOException { |
| |
| byte[] decodedData = null; |
| Base64.InputStream bis = null; |
| try { |
| // Set up some useful variables |
| java.io.File file = new java.io.File(filename); |
| byte[] buffer = null; |
| int length = 0; |
| int numBytes = 0; |
| |
| // Check for size of file |
| if (file.length() > Integer.MAX_VALUE) { |
| throw new java.io.IOException("File is too big for this convenience method (" + file.length() |
| + " bytes)."); |
| } // end if: file too big for int index |
| buffer = new byte[(int) file.length()]; |
| |
| // Open a stream |
| bis = new Base64.InputStream(new java.io.BufferedInputStream(new java.io.FileInputStream(file)), |
| Base64.DECODE); |
| |
| // Read until done |
| while ((numBytes = bis.read(buffer, length, 4096)) >= 0) { |
| length += numBytes; |
| } // end while |
| |
| // Save in a variable to return |
| decodedData = new byte[length]; |
| System.arraycopy(buffer, 0, decodedData, 0, length); |
| |
| } // end try |
| catch (java.io.IOException e) { |
| throw e; // Catch and release to execute finally{} |
| } // end catch: java.io.IOException |
| finally { |
| IOUtils.closeQuietly(bis); |
| } // end finally |
| |
| return decodedData; |
| } // end decodeFromFile |
| |
| /** |
| * Convenience method for reading a binary file and base64-encoding it. |
| * |
| * <p> |
| * As of v 2.3, if there is a error, the method will throw an |
| * java.io.IOException. <b>This is new to v2.3!</b> In earlier versions, it |
| * just returned false, but in retrospect that's a pretty poor way to handle |
| * it. |
| * </p> |
| * |
| * @param filename |
| * Filename for reading binary data |
| * @return base64-encoded string |
| * @throws java.io.IOException |
| * if there is an error |
| * @since 2.1 |
| */ |
| public static String encodeFromFile(String filename) throws java.io.IOException { |
| |
| String encodedData = null; |
| Base64.InputStream bis = null; |
| try { |
| // Set up some useful variables |
| java.io.File file = new java.io.File(filename); |
| byte[] buffer = new byte[Math.max((int) (file.length() * 1.4 + 1), 40)]; // Need |
| // max() |
| // for |
| // math |
| // on |
| // small |
| // files |
| // (v2.2.1); |
| // Need |
| // +1 |
| // for |
| // a |
| // few |
| // corner |
| // cases |
| // (v2.3.5) |
| int length = 0; |
| int numBytes = 0; |
| |
| // Open a stream |
| bis = new Base64.InputStream(new java.io.BufferedInputStream(new java.io.FileInputStream(file)), |
| Base64.ENCODE); |
| |
| // Read until done |
| while ((numBytes = bis.read(buffer, length, 4096)) >= 0) { |
| length += numBytes; |
| } // end while |
| |
| // Save in a variable to return |
| encodedData = new String(buffer, 0, length, Base64.PREFERRED_ENCODING); |
| |
| } // end try |
| catch (java.io.IOException e) { |
| throw e; // Catch and release to execute finally{} |
| } // end catch: java.io.IOException |
| finally { |
| IOUtils.closeQuietly(bis); |
| } // end finally |
| |
| return encodedData; |
| } // end encodeFromFile |
| |
| /** |
| * Reads <tt>infile</tt> and encodes it to <tt>outfile</tt>. |
| * |
| * @param infile |
| * Input file |
| * @param outfile |
| * Output file |
| * @throws java.io.IOException |
| * if there is an error |
| * @since 2.2 |
| */ |
| public static void encodeFileToFile(String infile, String outfile) throws java.io.IOException { |
| |
| String encoded = Base64.encodeFromFile(infile); |
| java.io.OutputStream out = null; |
| try { |
| out = new java.io.BufferedOutputStream(new java.io.FileOutputStream(outfile)); |
| out.write(encoded.getBytes("US-ASCII")); // Strict, 7-bit output. |
| } // end try |
| catch (java.io.IOException e) { |
| throw e; // Catch and release to execute finally{} |
| } // end catch |
| finally { |
| IOUtils.closeQuietly(out); |
| } // end finally |
| } // end encodeFileToFile |
| |
| /** |
| * Reads <tt>infile</tt> and decodes it to <tt>outfile</tt>. |
| * |
| * @param infile |
| * Input file |
| * @param outfile |
| * Output file |
| * @throws java.io.IOException |
| * if there is an error |
| * @since 2.2 |
| */ |
| public static void decodeFileToFile(String infile, String outfile) throws java.io.IOException { |
| |
| byte[] decoded = Base64.decodeFromFile(infile); |
| java.io.OutputStream out = null; |
| try { |
| out = new java.io.BufferedOutputStream(new java.io.FileOutputStream(outfile)); |
| out.write(decoded); |
| } // end try |
| catch (java.io.IOException e) { |
| throw e; // Catch and release to execute finally{} |
| } // end catch |
| finally { |
| IOUtils.closeQuietly(out); |
| } // end finally |
| } // end decodeFileToFile |
| |
| /* ******** I N N E R C L A S S I N P U T S T R E A M ******** */ |
| |
| /** |
| * A {@link Base64.InputStream} will read data from another |
| * <tt>java.io.InputStream</tt>, given in the constructor, and encode/decode |
| * to/from Base64 notation on the fly. |
| * |
| * @see Base64 |
| * @since 1.3 |
| */ |
| public static class InputStream extends java.io.FilterInputStream { |
| |
| private boolean encode; // Encoding or decoding |
| private int position; // Current position in the buffer |
| private byte[] buffer; // Small buffer holding converted data |
| private int bufferLength; // Length of buffer (3 or 4) |
| private int numSigBytes; // Number of meaningful bytes in the buffer |
| private int lineLength; |
| private boolean breakLines; // Break lines at less than 80 characters |
| private int options; // Record options used to create the stream. |
| private byte[] decodabet; // Local copies to avoid extra method calls |
| |
| /** |
| * Constructs a {@link Base64.InputStream} in DECODE mode. |
| * |
| * @param in |
| * the <tt>java.io.InputStream</tt> from which to read data. |
| * @since 1.3 |
| */ |
| public InputStream(java.io.InputStream in) { |
| this(in, DECODE); |
| } // end constructor |
| |
| /** |
| * Constructs a {@link Base64.InputStream} in either ENCODE or DECODE |
| * mode. |
| * <p> |
| * Valid options: |
| * |
| * <pre> |
| * ENCODE or DECODE: Encode or Decode as data is read. |
| * DO_BREAK_LINES: break lines at 76 characters |
| * (only meaningful when encoding)</i> |
| * </pre> |
| * <p> |
| * Example: <code>new Base64.InputStream( in, Base64.DECODE )</code> |
| * |
| * |
| * @param in |
| * the <tt>java.io.InputStream</tt> from which to read data. |
| * @param options |
| * Specified options |
| * @see Base64#ENCODE |
| * @see Base64#DECODE |
| * @see Base64#DO_BREAK_LINES |
| * @since 2.0 |
| */ |
| public InputStream(java.io.InputStream in, int options) { |
| |
| super(in); |
| this.options = options; // Record for later |
| this.breakLines = (options & DO_BREAK_LINES) > 0; |
| this.encode = (options & ENCODE) > 0; |
| this.bufferLength = encode ? 4 : 3; |
| this.buffer = new byte[bufferLength]; |
| this.position = -1; |
| this.lineLength = 0; |
| this.decodabet = getDecodabet(options); |
| } // end constructor |
| |
| /** |
| * Reads enough of the input stream to convert to/from Base64 and |
| * returns the next byte. |
| * |
| * @return next byte |
| * @since 1.3 |
| */ |
| @Override |
| public int read() throws java.io.IOException { |
| |
| // Do we need to get data? |
| if (position < 0) { |
| if (encode) { |
| byte[] b3 = new byte[3]; |
| int numBinaryBytes = 0; |
| for (int i = 0; i < 3; i++) { |
| int b = in.read(); |
| |
| // If end of stream, b is -1. |
| if (b >= 0) { |
| b3[i] = (byte) b; |
| numBinaryBytes++; |
| } else { |
| break; // out of for loop |
| } // end else: end of stream |
| |
| } // end for: each needed input byte |
| |
| if (numBinaryBytes > 0) { |
| encode3to4(b3, 0, numBinaryBytes, buffer, 0, options); |
| position = 0; |
| numSigBytes = 4; |
| } // end if: got data |
| else { |
| return -1; // Must be end of stream |
| } // end else |
| } // end if: encoding |
| |
| // Else decoding |
| else { |
| byte[] b4 = new byte[4]; |
| int i = 0; |
| for (i = 0; i < 4; i++) { |
| // Read four "meaningful" bytes: |
| int b = 0; |
| do { |
| b = in.read(); |
| } while (b >= 0 && decodabet[b & 0x7f] <= WHITE_SPACE_ENC); |
| |
| if (b < 0) { |
| break; // Reads a -1 if end of stream |
| } // end if: end of stream |
| |
| b4[i] = (byte) b; |
| } // end for: each needed input byte |
| |
| if (i == 4) { |
| numSigBytes = decode4to3(b4, 0, buffer, 0, options); |
| position = 0; |
| } // end if: got four characters |
| else if (i == 0) { |
| return -1; |
| } // end else if: also padded correctly |
| else { |
| // Must have broken out from above. |
| throw new java.io.IOException("Improperly padded Base64 input."); |
| } // end |
| |
| } // end else: decode |
| } // end else: get data |
| |
| // Got data? |
| if (position >= 0) { |
| // End of relevant data? |
| if ( /* !encode && */position >= numSigBytes) { |
| return -1; |
| } // end if: got data |
| |
| if (encode && breakLines && lineLength >= MAX_LINE_LENGTH) { |
| lineLength = 0; |
| return '\n'; |
| } // end if |
| else { |
| lineLength++; // This isn't important when decoding |
| // but throwing an extra "if" seems |
| // just as wasteful. |
| |
| int b = buffer[position++]; |
| |
| if (position >= bufferLength) { |
| position = -1; |
| } // end if: end |
| |
| return b & 0xFF; // This is how you "cast" a byte that's |
| // intended to be unsigned. |
| } // end else |
| } // end if: position >= 0 |
| |
| // Else error |
| else { |
| throw new java.io.IOException("Error in Base64 code reading stream."); |
| } // end else |
| } // end read |
| |
| /** |
| * Calls {@link #read()} repeatedly until the end of stream is reached |
| * or <var>len</var> bytes are read. Returns number of bytes read into |
| * array or -1 if end of stream is encountered. |
| * |
| * @param dest |
| * array to hold values |
| * @param off |
| * offset for array |
| * @param len |
| * max number of bytes to read into array |
| * @return bytes read into array or -1 if end of stream is encountered. |
| * @since 1.3 |
| */ |
| @Override |
| public int read(byte[] dest, int off, int len) throws java.io.IOException { |
| int i; |
| int b; |
| for (i = 0; i < len; i++) { |
| b = read(); |
| |
| if (b >= 0) { |
| dest[off + i] = (byte) b; |
| } else if (i == 0) { |
| return -1; |
| } else { |
| break; // Out of 'for' loop |
| } // Out of 'for' loop |
| } // end for: each byte read |
| return i; |
| } // end read |
| |
| } // end inner class InputStream |
| |
| /* ******** I N N E R C L A S S O U T P U T S T R E A M ******** */ |
| |
| /** |
| * A {@link Base64.OutputStream} will write data to another |
| * <tt>java.io.OutputStream</tt>, given in the constructor, and |
| * encode/decode to/from Base64 notation on the fly. |
| * |
| * @see Base64 |
| * @since 1.3 |
| */ |
| public static class OutputStream extends java.io.FilterOutputStream { |
| |
| private boolean encode; |
| private int position; |
| private byte[] buffer; |
| private int bufferLength; |
| private int lineLength; |
| private boolean breakLines; |
| private byte[] b4; // Scratch used in a few places |
| private boolean suspendEncoding; |
| private int options; // Record for later |
| private byte[] decodabet; // Local copies to avoid extra method calls |
| |
| /** |
| * Constructs a {@link Base64.OutputStream} in ENCODE mode. |
| * |
| * @param out |
| * the <tt>java.io.OutputStream</tt> to which data will be |
| * written. |
| * @since 1.3 |
| */ |
| public OutputStream(java.io.OutputStream out) { |
| this(out, ENCODE); |
| } // end constructor |
| |
| /** |
| * Constructs a {@link Base64.OutputStream} in either ENCODE or DECODE |
| * mode. |
| * <p> |
| * Valid options: |
| * |
| * <pre> |
| * ENCODE or DECODE: Encode or Decode as data is read. |
| * DO_BREAK_LINES: don't break lines at 76 characters |
| * (only meaningful when encoding)</i> |
| * </pre> |
| * <p> |
| * Example: <code>new Base64.OutputStream( out, Base64.ENCODE )</code> |
| * |
| * @param out |
| * the <tt>java.io.OutputStream</tt> to which data will be |
| * written. |
| * @param options |
| * Specified options. |
| * @see Base64#ENCODE |
| * @see Base64#DECODE |
| * @see Base64#DO_BREAK_LINES |
| * @since 1.3 |
| */ |
| public OutputStream(java.io.OutputStream out, int options) { |
| super(out); |
| this.breakLines = (options & DO_BREAK_LINES) != 0; |
| this.encode = (options & ENCODE) != 0; |
| this.bufferLength = encode ? 3 : 4; |
| this.buffer = new byte[bufferLength]; |
| this.position = 0; |
| this.lineLength = 0; |
| this.suspendEncoding = false; |
| this.b4 = new byte[4]; |
| this.options = options; |
| this.decodabet = getDecodabet(options); |
| } // end constructor |
| |
| /** |
| * Writes the byte to the output stream after converting to/from Base64 |
| * notation. When encoding, bytes are buffered three at a time before |
| * the output stream actually gets a write() call. When decoding, bytes |
| * are buffered four at a time. |
| * |
| * @param theByte |
| * the byte to write |
| * @since 1.3 |
| */ |
| @Override |
| public void write(int theByte) throws java.io.IOException { |
| // Encoding suspended? |
| if (suspendEncoding) { |
| this.out.write(theByte); |
| return; |
| } // end if: supsended |
| |
| // Encode? |
| if (encode) { |
| buffer[position++] = (byte) theByte; |
| if (position >= bufferLength) { // Enough to encode. |
| |
| this.out.write(encode3to4(b4, buffer, bufferLength, options)); |
| |
| lineLength += 4; |
| if (breakLines && lineLength >= MAX_LINE_LENGTH) { |
| this.out.write(NEW_LINE); |
| lineLength = 0; |
| } // end if: end of line |
| |
| position = 0; |
| } // end if: enough to output |
| } // end if: encoding |
| |
| // Else, Decoding |
| else { |
| // Meaningful Base64 character? |
| if (decodabet[theByte & 0x7f] > WHITE_SPACE_ENC) { |
| buffer[position++] = (byte) theByte; |
| if (position >= bufferLength) { // Enough to output. |
| |
| int len = Base64.decode4to3(buffer, 0, b4, 0, options); |
| out.write(b4, 0, len); |
| position = 0; |
| } // end if: enough to output |
| } // end if: meaningful base64 character |
| else if (decodabet[theByte & 0x7f] != WHITE_SPACE_ENC) { |
| throw new java.io.IOException("Invalid character in Base64 data."); |
| } // end else: not white space either |
| } // end else: decoding |
| } // end write |
| |
| /** |
| * Calls {@link #write(int)} repeatedly until <var>len</var> bytes are |
| * written. |
| * |
| * @param theBytes |
| * array from which to read bytes |
| * @param off |
| * offset for array |
| * @param len |
| * max number of bytes to read into array |
| * @since 1.3 |
| */ |
| @Override |
| public void write(byte[] theBytes, int off, int len) throws java.io.IOException { |
| // Encoding suspended? |
| if (suspendEncoding) { |
| this.out.write(theBytes, off, len); |
| return; |
| } // end if: supsended |
| |
| for (int i = 0; i < len; i++) { |
| write(theBytes[off + i]); |
| } // end for: each byte written |
| |
| } // end write |
| |
| /** |
| * Method added by PHIL. [Thanks, PHIL. -Rob] This pads the buffer |
| * without closing the stream. |
| * |
| * @throws java.io.IOException |
| * if there's an error. |
| */ |
| public void flushBase64() throws java.io.IOException { |
| if (position > 0) { |
| if (encode) { |
| out.write(encode3to4(b4, buffer, position, options)); |
| position = 0; |
| } // end if: encoding |
| else { |
| throw new java.io.IOException("Base64 input not properly padded."); |
| } // end else: decoding |
| } // end if: buffer partially full |
| |
| } // end flush |
| |
| /** |
| * Flushes and closes (I think, in the superclass) the stream. |
| * |
| * @since 1.3 |
| */ |
| @Override |
| public void close() throws java.io.IOException { |
| // 1. Ensure that pending characters are written |
| flushBase64(); |
| |
| // 2. Actually close the stream |
| // Base class both flushes and closes. |
| super.close(); |
| |
| buffer = null; |
| out = null; |
| } // end close |
| |
| /** |
| * Suspends encoding of the stream. May be helpful if you need to embed |
| * a piece of base64-encoded data in a stream. |
| * |
| * @throws java.io.IOException |
| * if there's an error flushing |
| * @since 1.5.1 |
| */ |
| public void suspendEncoding() throws java.io.IOException { |
| flushBase64(); |
| this.suspendEncoding = true; |
| } // end suspendEncoding |
| |
| /** |
| * Resumes encoding of the stream. May be helpful if you need to embed a |
| * piece of base64-encoded data in a stream. |
| * |
| * @since 1.5.1 |
| */ |
| public void resumeEncoding() { |
| this.suspendEncoding = false; |
| } // end resumeEncoding |
| |
| } // end inner class OutputStream |
| |
| } // end class Base64 |
